Wim Hof explains that your body contains 125,000 km of blood vessels with millions of tiny muscles. Cold showers train these micro-muscles, lowering your resting heart rate and making your heart work more efficiently.
Chapters
Challenging the cardiovascular system. 125,000 kilometers we got each and every one of us. All blood vessels, capillaries, veins, arteries. Once we begin to exercise that, the heart rate is going down because the little muscles and reflexes in that all the 2.5 times Is it 2.5 times? No, it's 3 times the world around is within us. There are millions of primitive little muscles and reflexes, and we got them. We are going to train them, and with that, the heart doesn't need to compensate for the low condition of those millions of little muscles and reflexes.